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Root cause analysis / Investigation

copilot.com

Reference RCA-4EDDF7B65C6A244C

Microsoft Chat website

Measurement point: Stealth NYC, 32 Avenue of the Americas.

Published investigation. Updates run automatically.

01 / Network path

Network path.

Endpoint measurements / ICMP IPv4

Latency over time.

Successful endpoint RTT recordings from up to one hour before and after the event. Points are sampled from the retained history.

Enter time range

Times use the selected timezone; choices include recorded samples and intervals across the available chart.

Use the recordings table below to view latency values.
Successful RTT recording Event interval

07 Nov 2026 02:45 – 07 Nov 2026 05:54 UTC. Hover or tap to inspect; drag across the chart to zoom. On touchscreens, first choose Select time range. Escape or Reset zoom restores the full range. Missing recordings are gaps; this is not an application availability or packet-loss chart.

Select a recording to explore nearby path observations.

View recorded values
Successful ICMP IPv4 RTT recordings; displayed points are a sample of the retained records.
Recorded at (UTC)RTT
6.560 ms
6.564 ms
6.534 ms
6.561 ms
6.540 ms
6.556 ms
6.557 ms
6.570 ms
6.547 ms
6.530 ms
6.537 ms
6.526 ms
6.593 ms
6.588 ms
6.518 ms
6.559 ms
6.544 ms
6.596 ms
6.545 ms
6.576 ms
6.531 ms
6.558 ms
6.548 ms
6.605 ms
6.542 ms
6.535 ms
6.724 ms
6.772 ms
6.744 ms
6.734 ms
6.741 ms
6.726 ms
6.753 ms
6.726 ms
6.759 ms
6.733 ms
6.721 ms
6.729 ms
6.776 ms
6.743 ms
6.746 ms
6.749 ms
6.743 ms
6.792 ms
6.757 ms
6.747 ms
6.782 ms
6.730 ms
6.709 ms
6.818 ms
6.722 ms
6.725 ms
6.752 ms
6.729 ms
6.730 ms
6.750 ms
6.748 ms
6.744 ms
6.743 ms
6.757 ms
6.787 ms
6.732 ms
6.791 ms
6.852 ms
6.750 ms
6.746 ms
6.751 ms
6.734 ms
6.744 ms
6.742 ms
6.741 ms
6.762 ms
6.731 ms
6.725 ms
6.776 ms
6.736 ms
6.734 ms
6.924 ms
6.748 ms
6.752 ms
6.761 ms
6.729 ms
6.739 ms
6.732 ms
6.750 ms
6.732 ms
6.744 ms
6.741 ms
6.981 ms
6.739 ms
6.782 ms
6.732 ms
6.751 ms
6.740 ms
6.743 ms
6.750 ms
6.781 ms
6.750 ms
6.748 ms
6.717 ms
6.743 ms
6.740 ms
6.723 ms
6.725 ms
6.746 ms
6.783 ms
6.775 ms
6.750 ms
6.747 ms
6.722 ms
6.746 ms
6.732 ms
6.748 ms
6.398 ms
6.402 ms
6.402 ms
6.402 ms
6.399 ms
6.410 ms
6.393 ms
6.394 ms
6.403 ms
6.443 ms
22.826 ms
22.843 ms
22.865 ms
22.875 ms
22.855 ms
22.834 ms
22.887 ms
22.842 ms
22.893 ms
22.899 ms
22.895 ms
22.847 ms
22.874 ms
22.892 ms
22.882 ms
22.850 ms
21.975 ms
21.959 ms
21.879 ms
21.949 ms
21.939 ms
22.866 ms
22.846 ms
22.861 ms
22.914 ms
22.930 ms
22.897 ms
22.020 ms
21.952 ms
21.929 ms
21.914 ms
21.974 ms
21.958 ms
21.945 ms
21.938 ms
21.979 ms
21.978 ms
21.925 ms
26.882 ms
26.779 ms
26.813 ms
26.776 ms
26.756 ms
26.782 ms
26.809 ms
26.773 ms
26.779 ms
26.771 ms
26.803 ms
26.815 ms
26.818 ms
26.830 ms
26.757 ms
26.807 ms
26.777 ms
26.780 ms
26.807 ms
26.770 ms
26.803 ms
26.818 ms
26.902 ms
26.785 ms
26.826 ms
22.897 ms
22.898 ms
22.017 ms
21.962 ms
22.033 ms
21.904 ms
22.046 ms
22.107 ms
21.963 ms
22.089 ms
22.004 ms
21.967 ms
22.906 ms
22.894 ms
22.892 ms
22.913 ms
22.848 ms
22.902 ms
22.887 ms
22.887 ms
22.907 ms
22.868 ms
22.903 ms
22.855 ms
22.876 ms
22.880 ms
6.724 ms
6.723 ms
6.796 ms
6.719 ms
6.732 ms
6.730 ms
6.746 ms
6.755 ms
6.734 ms
6.763 ms
6.770 ms
6.729 ms
6.741 ms
6.769 ms
6.775 ms
6.710 ms
6.735 ms
6.752 ms
6.750 ms
6.725 ms
6.713 ms
6.739 ms
6.730 ms
6.773 ms
6.725 ms
6.754 ms
6.740 ms
6.736 ms
6.730 ms
6.730 ms
6.735 ms
6.769 ms
6.722 ms
6.738 ms
6.737 ms
6.733 ms
6.753 ms
6.783 ms
6.785 ms
6.734 ms
6.739 ms
6.754 ms
6.787 ms
6.739 ms
6.741 ms
6.741 ms
6.742 ms
6.719 ms
6.726 ms
6.726 ms
6.740 ms
6.806 ms
6.755 ms
6.745 ms
6.755 ms
6.742 ms
6.781 ms
6.728 ms
6.761 ms
6.750 ms
6.754 ms
6.734 ms
6.735 ms
6.730 ms
6.727 ms
6.734 ms
6.748 ms
6.738 ms
6.779 ms
6.738 ms
6.793 ms
6.753 ms
6.745 ms
6.795 ms
6.748 ms
6.780 ms
6.759 ms
6.752 ms
6.792 ms
6.716 ms
6.747 ms
6.740 ms
6.766 ms
6.748 ms
6.748 ms
6.748 ms
6.753 ms
6.762 ms
6.728 ms
6.734 ms
6.768 ms
6.748 ms
6.733 ms
6.771 ms
6.768 ms
6.758 ms
6.765 ms
6.748 ms
6.722 ms
6.737 ms
6.742 ms
6.734 ms
6.736 ms
6.714 ms
6.729 ms
6.741 ms
6.760 ms
6.844 ms
6.727 ms
6.788 ms
6.758 ms
6.729 ms
6.791 ms
6.734 ms
6.729 ms
6.743 ms
6.774 ms
6.759 ms
6.742 ms
6.741 ms
6.799 ms
6.747 ms
6.748 ms
6.732 ms
6.751 ms
6.747 ms
6.749 ms
6.731 ms
6.551 ms
6.542 ms
6.541 ms
6.640 ms
6.547 ms
6.531 ms
6.565 ms
6.538 ms
6.528 ms
6.543 ms
6.547 ms
6.539 ms
6.544 ms
6.524 ms
6.624 ms
6.546 ms
6.580 ms
6.617 ms
6.611 ms
Network path / recorded observations

Network path observations.

16 observations

Choose a measurement type to see the closest of the available sampled observations to the selected chart point. Each probe is separate and may follow a different path.

Before

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.128 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.200 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.404 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop8.070 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop6.879 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop8.037 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.558 msReply RTT AS8075 · Microsoft
Before

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.158 msReply RTT AS8002 · Stealth
Before

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.170 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hopNo replyNo comparable RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop6.710 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.503 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.932 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hopNo replyNo comparable RTT ASN unavailable
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Destination6.842 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 4

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.124 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop28.450 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 4

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.150 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.663 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop6.842 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop34.769 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop6.154 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.411 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 5

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.139 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.941 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop1.292 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop27.611 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop27.250 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop23.573 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop26.378 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 5

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.140 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.812 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop1.825 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop26.333 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop23.427 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop23.083 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop24.294 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hop22.910 msReply RTT AS8075 · Microsoft
  9. TTL 9 Probe hop23.745 msReply RTT AS8075 · Microsoft
  10. TTL 10 Probe hop19.366 msReply RTT AS8075 · Microsoft
  11. TTL 11 Probe hop22.523 msReply RTT AS8075 · Microsoft
  12. TTL 12 Probe hopNo replyNo comparable RTT ASN unavailable
  13. TTL 13 Destination22.879 msReply RTT AS8075 · Microsoft
During

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.128 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.964 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hop11.234 msReply RTT AS8075 · Microsoft
  4. TTL 4 Probe hop6.793 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.580 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop7.281 msReply RTT AS8075 · Microsoft
During

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop2.681 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop195.462 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop8.534 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop7.498 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.921 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 2

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.141 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.104 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 2

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.161 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.984 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.320 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop7.390 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop98.774 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hop7.349 msReply RTT AS8075 · Microsoft
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination6.954 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 3

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.149 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop0.901 msReply RTT ASN unavailable
After

TCP traceroute / 443 · Recorded address 3

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.160 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.659 msReply RTT ASN unavailable
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop7.204 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hopNo replyNo comparable RTT ASN unavailable
  6. TTL 6 Probe hop7.213 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hopNo replyNo comparable RTT ASN unavailable
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Probe hopNo replyNo comparable RTT ASN unavailable
  12. TTL 12 Destination7.201 msReply RTT AS8075 · Microsoft
After

ICMP traceroute · Recorded address 1

Recorded trace · destination not reached by this trace


to UTC

  1. TTL 1 Probe hop0.372 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop4.250 msReply RTT AS8075 · Microsoft
After

TCP traceroute / 443 · Recorded address 1

Recorded trace · destination replied


to UTC

  1. TTL 1 Probe hop0.159 msReply RTT AS8002 · Stealth
  2. TTL 2 Probe hop1.048 msReply RTT AS8075 · Microsoft
  3. TTL 3 Probe hopNo replyNo comparable RTT ASN unavailable
  4. TTL 4 Probe hop6.804 msReply RTT AS8075 · Microsoft
  5. TTL 5 Probe hop6.824 msReply RTT AS8075 · Microsoft
  6. TTL 6 Probe hop8.346 msReply RTT AS8075 · Microsoft
  7. TTL 7 Probe hopNo replyNo comparable RTT ASN unavailable
  8. TTL 8 Probe hopNo replyNo comparable RTT ASN unavailable
  9. TTL 9 Probe hopNo replyNo comparable RTT ASN unavailable
  10. TTL 10 Probe hopNo replyNo comparable RTT ASN unavailable
  11. TTL 11 Destination6.543 msReply RTT AS8075 · Microsoft

RTT is the round trip to each responding hop, not the delay of the preceding link. TTL order may omit routers and does not prove direct links. A missing reply is not proof of packet loss. ASN labels are dated address associations; they do not establish the forwarding path or the operator at the event time. Up to three recorded traces per method and period are selected across the archive. Where no individual trace is available, a comparison may summarize a window; MTR observations aggregate multiple probes. Address aliases are independent across measurement types.

Same method / same recorded address

Compare the traces.

Compare one selected trace from before the event with one during it. Values are individual replies, not a statistical comparison.

No same-address, same-method pair is available among the selected replay samples. This does not mean no other matching traces were recorded.

RTTs include the return path. Different responders, missing replies and independent probe flows limit what a change can localize. MTR snapshots remain separate in the replay.

Event timeline.

Possible SLA event. Times shown are UTC.

Event opened
UTC
Last event observation
UTC
Recovery observed
UTC

Recorded recovery describes this event, not current reachability.

02 / Assessment

Assessment.

Investigation stateRecovered
Path assessment

Elevated latency observed.

Endpoint round-trip time was elevated during part of the event. The available path observations do not identify where the increase occurred.

What we observed

  • A sustained increase in measured round trip time was observed.
  • The measured destination address changed across the comparison period.

Recording counts describe collected measurements, not application availability or packet loss. Exact packet paths and the return path remain unverified.

Measurements at a glance.

Baseline RTT6.733 msUsual round trip before the event
Last recorded event RTT6.736 msLast successful event recording
Event p95 RTT26.816 ms95th percentile of successful recordings
Change from baseline+0.003 msLast event RTT compared with the baseline
Successful / expected recordings140 / 140Recorded endpoint samples during the event

RTT is round trip time; p95 describes the upper range of successful recordings. Endpoint measurements differ from individual trace replies and are not an uptime percentage.

Record sources and timestamps
Analysis updated
UTC
Public snapshot published
UTC
Public observation window
– UTC

Event and source timestamps are UTC. The latency chart uses its selected timezone. Page refresh times are separate from measurement timestamps.

03 / Method and limits

Method and limits.

How to interpret the sampled path and its limits

Corroborating the path.

Comparisons use matching destinations before and during the event. ICMP traces use echo probes. TCP/443 traces send SYN probes to port 443 only; they do not complete a TCP handshake or perform a TLS or HTTP exchange.

The Stealth gNMI interface verifies the active route-table choice and maps its primary next hop to the Stealth logical interface, configured attachment and, where applicable, the known LAG member set at each snapshot. Stable Stealth replies, together with mapped interface evidence showing no corresponding errors or sustained capacity pressure, reduce the likelihood of a Stealth forwarding issue. An 80% load warning warrants investigation; it does not prove congestion. Lower interval averages can conceal bursts or queue pressure. Optical readings assess the physical link, not congestion.

What remains unseen.

Probe reply handling can differ from packet forwarding. A slow intermediate reply that disappears at later hops does not locate a forwarding problem. A destination that does not respond to a trace is not thereby shown to be unavailable.

Stealth does not use ECMP in this monitored scope. The route snapshot does not identify which physical LAG member carried a particular independent probe, attest line-card forwarding at that packet instant, prove the exact application packet flow or observe the return path. RTT includes the return path, which may differ. No remote reverse traceroute is available. Tunnels and silent routers may hide parts of the path. Address registration alone does not establish the forwarding operator or responsibility.

References: ICMP reply handling / RFC 1812 · Round trip measurements / RFC 2681 · Full methodology